JPS6273029A - Controlling device for air conditioner - Google Patents

Abstract

PURPOSE:To perform continuously heating operation by heat pump cycle when no frost deposits and by an electric heater when frost deposits, by detecting frost deposition on an outdoor side heat exchanger, stopping the operation of a compressor on a signal that frost has been detected during heating operation, and thereby energizing the electric heater. CONSTITUTION:During heating operation, when outdoor temperature or the temperature sensor 10 and a heat exchanger sensor 11 detects such a fall in temperature and judges that the outdoor side heat exchanger 5 has been frosted, so that an electric heater 7 is energized and at the same time a compressor 1 ceases to operate. As a result, a heating operation is carried out by the electric heater 7 and an indoor fan 6. After that, when the frosted condition is removed, conduction of the electric heater 7 is turned off and the compressor 1 is actuated again, so that heating operation by heat pump cycle is carried out.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to the control of an air conditioner that can perform cooling/heating operation by switching a four-way valve, and particularly relates to an operating device for the front box of an outdoor heat exchanger. It is something.

(b) Conventional technology In general, the conventional control of air conditioners is
There was something like the one described in Publication No. 2347.

This publication describes a system that performs heating operation using a heat pump cycle by switching the four-way valve. When frost forms on the outdoor heat exchanger and the defrost switch is activated, the four-way valve is switched again to restart the compressor. There was a description of one that operates and performs defrosting operation using Hovto gas. During this defrosting operation, the air volume of the indoor fan was reduced and, at the same time, the auxiliary electric heater was energized to prevent cold air from blowing out.

(c) Problems to be Solved by the Invention In such an air conditioner, the refrigeration cycle becomes the cooling cycle during the defrosting operation, and the heating operation is essentially interrupted. Although heating was performed using an auxiliary electric heater, this only compensated for the amount of cooling that would occur in the indoor heat exchanger during defrosting operation. Therefore,
Particularly when the outside air temperature is low, the defrosting operation takes a long time, making it difficult to perform the heating operation.

In view of these problems, the present invention proposes a control device that can perform continuous heating operation.

(to) Means for solving the problems The present invention provides a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device,
Configure a refrigeration cycle by sequentially connecting outdoor heat exchangers,
In an air conditioner that has an electric heater in the same air path as the indoor heat exchanger and is capable of cooling and heating operation, there is a frost detection section that detects frost on the outdoor heat exchanger, and a frost detection section during heating operation. The controller is equipped with a control section that stops the operation of the compressor and energizes the electric heater at the output of the compressor.

(E) Function The air conditioner control device of the present invention can perform heating operation using a heat pump cycle when the outdoor heat exchanger is not frosted, and when frost has formed, heating operation can be performed using an electric heater. It is.

Embodiments Below, embodiments of the invention will be explained with reference to the drawings. First, Fig. 1 is a schematic diagram of an air conditioner using the control device of the present invention. 2) A refrigeration cycle is constructed by connecting an indoor heat exchanger (3), a pressure reducing device (4), and an outdoor heat exchanger (5) in a ring shape through refrigerant piping.

When the four-way valve (2) is energized (the state indicated by the solid line in the figure), the refrigerant discharged from the compressor (1) flows in the direction of the solid arrow to the indoor heat exchanger (3) and the outdoor heat exchanger. The container (5) functions as a condenser and an evaporator, respectively, to perform indoor heating operation.

When the four-way valve (2) is in a de-energized state (the state indicated by the dotted line in the figure), the refrigerant discharged from the compressor (1) flows in the direction of the dotted arrow, passing through the indoor heat exchanger (3) and the outdoor heat exchanger. The container (5) functions as an evaporator and a condenser, respectively, to perform indoor cooling operation.

(6) is an indoor fan (propeller fan), and an indoor heat exchanger +31 and an electric heater (
have power. (8) is an outdoor fan (propeller fan), and an outdoor heat exchanger (5) is provided in the air path of this fan. (9) is a fan motor that drives the fan (6).

Note that α■ is an outside temperature sensor that detects the outside air temperature, and DI) is a heat exchange sensor that detects the temperature of the outdoor heat exchanger (5).

FIG. 2 is an electrical circuit diagram of the main part of the control device according to the present invention. First, (12+ is an operation mode selection switch, which can select cooling operation (COOL), fan operation (FAN), and heating operation (HEAT). , cooling, and heating operation can further set the speed of the fan motor (9) to high, medium to low (υ).
2), +31 K H 77 motor (9111
7) υ, (mouth, ■) are connected to the terminals, respectively.

(131 is a room temperature sensor, and the contact piece is switched according to the set value and the room temperature.

(1st generation'! Frost formation detection unit, consisting of an outside temperature sensor (10) and an old heat exchanger sensor), outputs when the outside temperature is 1.5 degrees or less or the heat exchanger temperature is 17 degrees or less. It is something to put out. This is a relay that is energized during heating operation, and has a normally open contact side and a switching contact piece 11n+. In addition, the four-way valve (
2) is connected in parallel with relay 05.

a) It is a relay having a normally open contact l, and is connected to the output of the box arrival detection unit via a normally open contact α6) and a thermostat contact Cα of the electric heater (7). In addition, Qυ is a relay connected in parallel with relay 081, and has a normally closed contact (
It has two powers.

θ is a relay having a normally open contact piece t241, and is connected to the normally closed terminal side of the switching contact piece Q7i via a normally closed contact piece 4.

In addition, the compressor (1) is equipped with a circulating thermo contact of the compressor (1).
and the power supply bus through a normally open contact Q.0.

Note that (a) is the operating capacitor for the compressor +1) and fan motor (9), and the other is the current fuse for the electric heater (7).

When operating an air conditioner using a controller having a frost detection section and a control section configured as described above, first select the selection switch /ch (when +21 is set to cooling operation). The four-way valve (2) becomes de-energized and the cooling operation cycle begins.Next, when the room temperature becomes higher than the value set in the room temperature sensor u31, the relay CI!3) is energized and the normally open contact (2) is turned on.
41 is closed and the compressor (11) starts operating.

In other words, cooling operation is performed.

When the selection switch (+21) is set to heating operation, the four-way valve (2) is first re-energized and the heat pump cycle starts in heating operation.At the same time, the relay (15) is energized, one side of the normally open contact is closed, and the switching contact 0η is turned on. Switch to normally open terminal side.

The switching contact (171) switches and power is supplied to the frost detection unit 041. If the room temperature is lower than the set value of the room temperature sensor U, the relay (24) is energized and the normally open contact (2) is switched on. When the compressor f1) is closed, the operation of the compressor f1 is started.
9) rotates at a set speed and drives fans (6) and (8).

As this heating operation continues, if the pressure air temperature decreases or the temperature of the outdoor heat exchanger (5) drops, it is determined that the outdoor P exchanger (5) has reached tJ'J, and the output is closed to the normally open state. A relay (181, CD) is connected through the contact piece 061.

This closes the normally open contact (1) and energizes the electric heater (power). At the same time, the normally closed contact (2) opens and connects the compressor (1).
start or stop. That is, heating operation is performed using an electric heater (power) and an indoor fan (6).

After that, when the frost on the outdoor heat exchanger (5) is removed, power to the relays (1 group and CD) is cut off, the compressor (1) is operated again, and heating operation using the heat pump cycle is resumed. It is something that is done.

(g) Effects of the invention The present invention provides a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device,
Configure a refrigeration cycle by sequentially connecting outdoor heat exchangers,
In an air conditioner that has an electric heater in the same air path as the indoor heat exchanger and is capable of cooling and heating operation, there is a frost detection unit that detects frost on the outdoor heat exchanger, and a frost detection unit that detects frost formation during heating operation. Since the controller is equipped with a control unit that stops the operation of the compressor and energizes the electric heater based on the output of the unit, when there is no frost on the outdoor heat exchanger (5), heating operation is performed using the heat pump cycle. When the outdoor heat exchanger (5) becomes frosted, the operation of the compressor is stopped and heating operation is performed using the electric heater.
Continuous heating operation is always maintained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of an air conditioner using the present invention, and FIG. 2 is an air circuit diagram of essential parts used in the control device for the air conditioner shown in FIG. (1)...Compressor, (2)...Four-way valve, (3)...
... Indoor heat exchanger, (4) ... Pressure reducing device, (
5)...Outdoor heat exchanger, (power...electric heater,
α4... Frost detection section. Figure 1 Figure 2

Claims (1)

[Claims] (1) A refrigeration cycle is constructed by sequentially connecting a compressor, four-way valve, indoor heat exchanger, pressure reducing device, and outdoor heat exchanger, and an electric heater is located in the same air path as the indoor heat exchanger. An air conditioner capable of heating and cooling operation has a frost detection section that detects frost on the outdoor heat exchanger, and an output from the frost detection section that stops compressor operation during heating operation and turns on electricity to the electric heater. 1. A control device for an air conditioner, comprising: a control section for controlling the air conditioner.